Android Smack 4.2如何上传文件？

implementation 'org.igniterealtime.smack:smack-android-extensions:4.2.4'
implementation 'org.igniterealtime.smack:smack-tcp:4.2.4'
implementation 'org.igniterealtime.smack:smack-im:4.2.4'
implementation 'org.igniterealtime.smack:smack-extensions:4.2.4'
implementation 'org.igniterealtime.smack:smack-core:4.2.4'
implementation 'org.igniterealtime.smack:smack-xmlparser-stax:4.2.4'
implementation 'org.igniterealtime.smack:smack-sasl-provided:4.2.4'

XMPPTCPConnectionConfiguration config = XMPPTCPConnectionConfiguration.builder()
    .setXmppDomain("your-xmpp-domain")
    .setHost("your-host")
    .setPort(your-port)
    .setSecurityMode(ConnectionConfiguration.SecurityMode.disabled)
    .setDebuggerEnabled(true)
    .build();

AbstractXMPPConnection connection = new XMPPTCPConnection(config);
connection.connect();
connection.login("your-username", "your-password");

FileTransferManager manager = FileTransferManager.getInstanceFor(connection);
manager.addFileTransferListener(new FileTransferListener() {
    @Override
    public void fileTransferRequest(FileTransferRequest request) {
        IncomingFileTransfer transfer = request.accept();
        try {
            File file = new File("your-file-path");
            transfer.recieveFile(file);
        } catch (SmackException | IOException e) {
            e.printStackTrace();
        }
    }
});

OutgoingFileTransfer transfer = manager.createOutgoingFileTransfer("recipient-jid");
try {
    transfer.sendFile(new File("your-file-path"), "description");
} catch (SmackException e) {
    e.printStackTrace();
}